Deformation, warming and softening of Greenland’s ice by refreezing meltwater
Bell, Robin ; Tinto, Kirsteen ; Das, Indrani ; Wolovick, Michael ; Chu, Winnie ; Creyts, Timothy ; Fearson, Nicholas ; Abdi, Hakim LU
and Paden, John
(2014)
In Nature Geoscience
7.
p.497-502
- Abstract
- Meltwater beneath the large ice sheets can influence ice flow by lubrication at the base or by softening when meltwater refreezes to form relatively warm ice. Refreezing has produced large basal ice units in East Antarctica. Bubble-free basal ice units also outcrop at the edge of the Greenland ice sheet5, but the extent of refreezing and its influence on Greenland’s ice flow dynamics are unknown. Here we demonstrate that refreezing of meltwater produces distinct basal ice units throughout northern Greenland with thicknesses of up to 1,100 m. We compare airborne gravity data with modelled gravity anomalies to show that these basal units are ice. Using radar data we determine the extent of the units, which significantly disrupt the overlying... (More)
- Meltwater beneath the large ice sheets can influence ice flow by lubrication at the base or by softening when meltwater refreezes to form relatively warm ice. Refreezing has produced large basal ice units in East Antarctica. Bubble-free basal ice units also outcrop at the edge of the Greenland ice sheet5, but the extent of refreezing and its influence on Greenland’s ice flow dynamics are unknown. Here we demonstrate that refreezing of meltwater produces distinct basal ice units throughout northern Greenland with thicknesses of up to 1,100 m. We compare airborne gravity data with modelled gravity anomalies to show that these basal units are ice. Using radar data we determine the extent of the units, which significantly disrupt the overlying ice sheet stratigraphy. The units consist of refrozen basal water commonly surrounded by heavily deformed meteoric ice derived from snowfall. We map these units along the ice sheet margins where surface melt is the largest source of water, as well as in the interior where basal melting is the only source of water. Beneath Petermann Glacier, basal units coincide with the onset of fast flow and channels in the floating ice tongue. We suggest that refreezing of meltwater and the resulting deformation of the surrounding basal ice warms the Greenland ice sheet, modifying the temperature structure of the ice column and influencing ice flow and grounding line melting. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4648346
- author
- Bell, Robin
; Tinto, Kirsteen
; Das, Indrani
; Wolovick, Michael
; Chu, Winnie
; Creyts, Timothy
; Fearson, Nicholas
; Abdi, Hakim
LU
and Paden, John
- publishing date
- 2014
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Greenland, Arctic, Climate research, Remote sensing
- in
- Nature Geoscience
- volume
- 7
- pages
- 497 - 502
- publisher
- Nature Publishing Group
- external identifiers
-
- scopus:84903521170
- ISSN
- 1752-0908
- DOI
- 10.1038/ngeo2179
- language
- English
- LU publication?
- no
- id
- 8d78d8bd-418f-4df7-87b6-6fb637332ace (old id 4648346)
- date added to LUP
- 2016-04-01 10:18:06
- date last changed
- 2023-01-03 21:56:53
@article{8d78d8bd-418f-4df7-87b6-6fb637332ace,
abstract = {{Meltwater beneath the large ice sheets can influence ice flow by lubrication at the base or by softening when meltwater refreezes to form relatively warm ice. Refreezing has produced large basal ice units in East Antarctica. Bubble-free basal ice units also outcrop at the edge of the Greenland ice sheet5, but the extent of refreezing and its influence on Greenland’s ice flow dynamics are unknown. Here we demonstrate that refreezing of meltwater produces distinct basal ice units throughout northern Greenland with thicknesses of up to 1,100 m. We compare airborne gravity data with modelled gravity anomalies to show that these basal units are ice. Using radar data we determine the extent of the units, which significantly disrupt the overlying ice sheet stratigraphy. The units consist of refrozen basal water commonly surrounded by heavily deformed meteoric ice derived from snowfall. We map these units along the ice sheet margins where surface melt is the largest source of water, as well as in the interior where basal melting is the only source of water. Beneath Petermann Glacier, basal units coincide with the onset of fast flow and channels in the floating ice tongue. We suggest that refreezing of meltwater and the resulting deformation of the surrounding basal ice warms the Greenland ice sheet, modifying the temperature structure of the ice column and influencing ice flow and grounding line melting.}},
author = {{Bell, Robin and Tinto, Kirsteen and Das, Indrani and Wolovick, Michael and Chu, Winnie and Creyts, Timothy and Fearson, Nicholas and Abdi, Hakim and Paden, John}},
issn = {{1752-0908}},
keywords = {{Greenland; Arctic; Climate research; Remote sensing}},
language = {{eng}},
pages = {{497--502}},
publisher = {{Nature Publishing Group}},
series = {{Nature Geoscience}},
title = {{Deformation, warming and softening of Greenland’s ice by refreezing meltwater}},
url = {{https://lup.lub.lu.se/search/files/1726962/4648347.pdf}},
doi = {{10.1038/ngeo2179}},
volume = {{7}},
year = {{2014}},
}